If the Webhook sends a response back to Lead Liaison don't forget to setup the Response Mapping. A Response Mapping will map the Webhook data object to a Lead Liaison field. Do get to the Response Mapping page, click the gear under the Actions column on the Manage Webhooks page and select Response Mapping.
To manage your your Incoming Webhooks go to Settings > App Setup > Webhooks. A table similar to the one below will appear.
Table columns are explained in detail below: